Exam 3 Flashcards

A. Friedman - Purdue University

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1
Q

Dyenin and kinesin interact with

A

microtubules

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2
Q

Myosin interacts with

A

microfilaments

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3
Q

Intermediate filaments

A

no role in movement

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4
Q

Extracellular matrix function

A

holds cells into tissues, forms basal lamina

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5
Q

Basal lamina function

A

separates epithelial (layered) cells from the rest of the body

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6
Q

ECM is __ from cells by __

A

secreted; exocytosis

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7
Q

Term for plasma membrane permeability

A

selectively permeable

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8
Q

What chemically modifies proteins in the membrane

A

glycoproteins

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9
Q

Membrane contains what in addition to phospholipids

A

cholesterol and glycolipids

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10
Q

Mobility of membrane proteins and lipids

A

Not fixed; will move laterally in the plane of the membrane (fluid mosaic)

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11
Q

Name for part polar and part nonpolar

A

ampipathic

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12
Q

Area of phospholipid monolayer is __ the area of the starting cells

A

twice

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13
Q

Which part of the bilayer forms the central barrier between inside and outside cell

A

Hydrophobic tails

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14
Q

Excluding holes, pores and proteins the membrane is permeable to __ and impermeable to __

A

nonpolar and small molecules; polar, large, and charged molecules

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15
Q

Integral membrane proteins

A

span across membrane; tightly bound

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16
Q

3 domains of integral membrane proteins

A

intracellular, transmembrane, extracellular

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17
Q

Peripheral membrane proteins

A

only on one surface (either extra- or intracellular); loosely bound

18
Q

Membranes are more or less fluid at high temps

A

more fluid

19
Q

Unsaturated and shorter fatty acids chains

A

increase membrane fluidity

20
Q

Saturated and longer fatty acid chains

A

decrease membrane fluidity

21
Q

Relationship between temp and fluidity

A

direct

22
Q

If temp decreases cell will make fatty acids with more

A

unsaturated and shorter chains

23
Q

If temp increases cell will make fatty acids with more

A

saturated and longer chains

24
Q

Are cold- or warm-blooded animals healthier

A

cold-blooded

25
Q

Simple diffusion

A

moves down concentration gradient

26
Q

Facilitated diffusion

A

charged or large polar molecules

27
Q

Channel proteins

A

always open to allow constant movement of particles

28
Q

Carrier proteins

A

open and close to permit movement of molecules across the membrane

29
Q

Active transport

A

moves against concentration gradient

30
Q

hypertonic solution

A

higher concentration of solutes outside cell

31
Q

cell placed in hypertonic sloution

A

shrivels (due to loss of water)

32
Q

hypotonic solution

A

higher concentration of solutes inside cell

33
Q

cell placed in hypotonic solution

A

swells and lyses (bursts) due to gain of water

34
Q

Impermeable connections outside cells

A

tight junctions

35
Q

Close connections between 2 cells; provide mechanical strength

A

Anchoring junctions

36
Q

Desmosomes

A

Connect cytoskeleton of 2 cells

37
Q

Hemidemosomes

A

Connect cytoskeleton of a cell to the ECM

38
Q

Allow molecules and signals to move between cells

A

Communicating junctions

39
Q

Communicating junctions in animals

A

Gap junctions

40
Q

Communicating junctions in plants

A

Plasmodesmata